add magical fix things on below 3.9 line

mastodon/types.py

@@ -1,3 +1,4 @@
+from __future__ import annotations # pythong < 3.9 compat
 from datetime import datetime
 from typing import Union, Optional, Tuple, List, IO, Dict
 from mastodon.types_base import AttribAccessDict, IdType, MaybeSnowflakeIdType, PrimitiveIdType, EntityList, PaginatableList, NonPaginatableList, PathOrFile, WebpushCryptoParamsPubkey, WebpushCryptoParamsPrivkey, try_cast_recurse, try_cast